const Koa = require("koa");
const app = new Koa();

app.use(async (ctx) => {
  let _html = "404 NotFound";
  switch (ctx.url) {
    case "/":
      _html = "<h1>Index</h1>";
      break;
    case "/adout":
      _html = "<h1>About</h1>";
      break;
    case "/hello":
      _html = "<h1>world</h1>";
      break;
    default:
      break;
  }
  ctx.body = _html;
});

app.listen(3000);
